Measurement-computing USB-2627 Instrukcja Użytkownika Pobierz pdf (Strona 23)

USB-2627 User's Guide Specifications

External trigger

Table 11. External trigger specifications

Parameter

Specification

Trigger source

TTLTRG

Trigger mode

Software programmable for edge or level sensitive, rising or falling edge, high or low

level. Power on default is edge sensitive, rising edge.

Trigger latency

1 µs + 1 clock cycle max

Trigger pulse width

100 ns min

Input type

33 Ω series resistor and 49.9 kΩ pull-down to GND

Input high voltage

2.2 V min

5.5 V absolute max

Input low voltage

1.5 V max

–0.5 V absolute min

0 V recommended min

External clock

Table 12. External clock I/O specifications

Parameter

Specification

Terminal names

XAPCR, XDPCR

Terminal types

Input, active on rising edge

Terminal descriptions

Receives pacer clock from external source

Input clock rate

1 MHz max

Clock pulse width

100 ns min

Input type

33 Ω series resistor, 47 kΩ pull-down to GND

Input high voltage

2.2 V min

5.5 V absolute max

Input low voltage

1.5 V max

–0.5 V absolute min

0 V recommended min

Counter

Table 13. Counter specifications

Parameter

Specification

Terminal names

CNT0, CNT1, CNT2, CNT3

Number of channels

4 channels

Resolution

32-bit

Counter type

Event counter

Input type

33 Ω series resistor, 47 kΩ pull-down to GND

Input source

68-pin SCSI: CNT0 (pin 5), CNT1 (pin 39), CNT2 (pin 4), CNT3 (pin 38)

40-pin (J4): CNT0 (pin 35), CNT1 (pin 34), CNT2 (pin 37), CNT3 (pin 36)

Counter read/writes rates

(software paced)

33 to 8,000 reads/writes per second typ; system dependent

Input high voltage

2.2 V min

Input low voltage

1.5 V max

Maximum input voltage range

–5 V to +10 V max

Input frequency

20 MHz, max

High pulse width

100 ns, min

Low pulse width

100 ns, min

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 29

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